Coil support



Egg, i5), L T RHOADES COIL SUPPORT Filed June 11, 1923 2 Sheets-Sheet 1 Lewis? T Rfioades June-prom 5.. T. RHOADES COIL SUPPORT 2 Sheets-Sheet Filed June 11, 1923 between the PATENT OFFICE.

coir sorrows.

sp ines-Lion filed June 11,

may concern." Be it kn on that A, Lewis T.

RrioAnns, a citizen of the Unit-ed States, residing at Mont (llare, in the county of Montgomery and State of Pennsylvania, have invented certain new and useful lmprovements in Coil Supportspof which the following is a specification.

My invention relates to supports for coil windings oi a type particularly adapted for use in radio pparatus. l retofore, the supports used r holding coils have been of a type which requires solid dielectric mate rial disposed, Within the magnetic field and coils, or between the coils and a magnetic core or other parts adapted to receive an induced current from the coils, or of a type in which air was employed as the dielectric. The solid dielectric disposed etween the coils is objectionable because its insulation imperfect and some electric current passes between the inner and outer coils. it is object-i icicle because it is an imperfect conductor of magnetic Waves and because its conductivity varies throughout its ant. this noinunii'ormity causes hysteresis. The presence of solid dielectric material within the magnetic field and contact of such :iaterial with any part of the coils objectionable, and therefore the solid material and the contact should he reduced to the minimum. Air is the ideal dielectric but its use involves a problem as to mount ing and spacing the coils which, so far as i am aware, has never been adequately solved.

The objects my invention are to supply a support for coils in which there is no solid dielectric material between the coils, in which the solid. dielectric material within the magnetic field one the contact of such material with the coils a; reduced to the minimum, and to provide a simply constructed support whichmay be easily assembled and the coils properly and efiiciently spaced by any unskilled person of ordinary ntelligence.

These objects, and other advantageous ends which will he described. hereinaher, I attain in the :loliowing manner, reference being had to the accoinpauyin drawings in which i I I ing sheet material 1923. Serial No. 644,723.

Figure l is a side elevation of a radio inl strument, known as a. transformer, constructed in accordance with my invention,

Figure 2 a top plan view of Figure 1 w Figure 3. a section on line 33 of l igure 2, v

Figure 4 a section on line {1- of Figure 1, and Figure 5 a perspective view of a coil holder which forms a part of my invention. Referring to the drawings, 1 indicates my improved coil. support which includes two plates 2 preferably stamped from insulatof substantially rectangulan form, and hereinafter called coil holders. Two opposing edges of eachcoil holder are cut away to form comparatively long recesses 3, adapted to receive an outer coil 5, and ly' from the long recesses, adapted to receive an inner coil 6 of comparatively small length and diameter. The longitudinal edges 7 of recess 3 engage the inner periphery of the longer coil and serve to support it while the shoulders 8 hold the coil againstmovement in the direction of its axis. he longitudinal edges 9 of the inner recess engage the inner periphery of the smaller coil and serve to support it while the'shoulders 10 hold it against movement in the direction of its axis.

To hold the edges 7 and 9 in engagement with the windings of the coils 5 and 6, I provide spacers 11 disposed between the coil holders near their upper andlower edges. A bolt 12 passes through each spacer 11 and the coil holders 2 to rigidly connect the coil holders and securely hold them in engagement with the windings of the coils, thus keeping the, coils properly spaced relatively to each other. secured to the coil holders in any suitable position, preferably as shown at 13, for electrically connecting one end of the large coil 5, at 14 for connecting the other end of the large coil, at 15 for connecting one end of. the small coil 6 and at 16 for connecting the other end of the small coil.

To hold my improved support in a properposition relatively to other instruments'in radio apparatus shorter recesses .4, extending inward-.

Terminal posts are I provide-a. pair of short brackets 17 secured to the lower edge oi one on a collapsible mandrel.

of the coil holders by screws or the like and a long bracket 18 secured to the lower edge of the other coil holder by the bolt 12. These brackets hold the support in an inclined position so that the electrical in- .li'uence, from other instruments, on the coils 5 and 6 will be reduced to a minimum.

In assembling an instrument having my improved support the coils are first wound A coating of hardening material of any suitable description such as shellac is applied to keep the windings together. The coils are then removed from the mandrel and placed in position on the coil holders as shown in Figures 3 and 4c. The spacers are then placed between the coil holders and the bolts 12 passed through the spacers and coil holders and secured thereto. The terminal posts are then electrically connected to the ends of the coils and the brackets secured to the lower edges of'the, coil holders. The instrument is then ready for use.

1n myimproved coil support. there is no solid dielectric material between the coils, the dielectric material within the magnetic field is reduced to the minimum, the contact of the coils with dielectric material is also reduced to the minimum, and the parts are easily assembled and securely held in proper spaced relation. The coil holders may be stamped from sheet material and all holes and recesses formed in one operation at much less cost than the tubes heretofore used and with a considerable saving of in sulating material, and the construction is but consider that I am at liberty to make for spacing and connecting the holding' plates.

2. A coreless coil support consisting ot a pair of coil holding plates oi insulating material, each plate having recesses 'l'or receiving coils of diilerent diameter, the recesses extending edgewise oi the plates. the length of one recess being equal to the width of the outer coil, and the length of another recess being equal to the width of the inner (oil. and means for spacing and connecting the holding plates.

3. A coil support consisting ot a pair of coil holding plates, each plate having re eesses for receiving coils ot different diameter, the recesses extending edgewise of the plates, the length of one recess being equal to the width of the outer coil and the length of another recess being equal to the width of the inner coil, and means for spacing and connecting the holding plates.

4. A coil support consisting of a pair of coil holdii'ig plates, each plate having reoi different depth, the length of the recesses being edgcwise ot the plates Whereby the plates are adapted to receive coils of different diameter, each coil having its windings laterally parallel, and means for spacing and connecting the holding plates.

In testimony whereof I have signed my name to this specification in the presence of two subscril'iing Witnesses.

LEWIS T. RHOADES. lVitnesses Tmmsa MODADE, LEO A. GOTWALS.

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